作物育种学的基本理论是（）。A.遗传学 B.生物学 C.植物学 D.生物进化论

阅读理解。

     Everyone knows the smart black-and-white dog that sits on top of a red doghouse with his best friend

-- a bird called Woodstock.

    This year Snoopy turns sixty. Created by the American cartoonist Charles Schulz in 1950, the clever dog

is loved by kids and adults. He speaks more than 20 languages and appears daily in 26,000 newspapers around

the world. When Snoopy first appeared, he was just like other pet dogs. But two years later, he had begun

to speak with simple words and sounds.

     By 1957 he could walk on two legs and was going to school with his master, Charlie Brown, who failed

at just about everything.

     Snoopy has done lots of jobs. He has been a bow-tie wearing lawyer, a tennis player and Olympic figure

skater, a world famous grocery cashier, a pilot and even the first astronaut on the moon.

     However, Snoopy has always dreamed of being a famous writer. The beginning of his story is always, "It

was a dark and stormy night…" Unluckily for him no one has ever wanted to publish (出版) the story.

     Snoopy easily falls in love but always has his heart broken. He eats to forget, but it never works.

     Snoopy is an insightful, feel-good and sometimes sad dog. If you think a little about his words, you might

find them full of life lessons. Among his most famous lines are "To live is to dance, to dance is to live." and

"Yesterday I was a dog. Today I'm a dog. Tomorrow I'll probably still be a dog."

1. How many cartoon characters are mentioned in the passage?

A. Two.

B. Three.

C. Four.

D. Five.

2. How can we know Snoopy is popular around the world?

A. He appears daily in 26,000 newspapers.

B. He's just like a human.

C. He has done all kinds of jobs.

D. He's unlucky in life.

3. From the passage we can learn that _________.

A. Snoopy has a successful master

B. Snoopy is a lucky dog in love

C. Snoopy is a success as a writer

D. Snoopy can teach us life lessons

我国是文明古国，在化学工艺像______、______、______等发明很早，商